CN204189949U - Uhf band near field RFID read-write antenna - Google Patents
Uhf band near field RFID read-write antenna Download PDFInfo
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- CN204189949U CN204189949U CN201420635127.6U CN201420635127U CN204189949U CN 204189949 U CN204189949 U CN 204189949U CN 201420635127 U CN201420635127 U CN 201420635127U CN 204189949 U CN204189949 U CN 204189949U
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Abstract
The utility model provides a kind of novel uhf band near field RFID read-write antenna, comprises substrate, first module, second unit and feeding network.Wherein first module and second unit are formed by conductor, and are positioned at the upper surface of substrate; First module and second unit comprise distributing point, current return path, terminal short circuit point and at least one electric current arm respectively, cross arrangement between the electric current arm of two unit but non-intersect; Feeding network comprises the top conductor being positioned at upper surface of substrate and the lower floor's conductor being positioned at substrate lower surface and two conductive through holes, and two-layer conductor forms pinacoid transmission line jointly; The top conductor of feeding network is directly connected with one end of the distributing point of first module, the distributing point opening part of second unit respectively, and its lower floor's conductor is connected by described two conductive through holes with the other end of the distributing point of first module, the distributing point opening part of second unit respectively.Antenna of the present utility model can realize the distribution of large-area inferred-zero uniform magnetic field.
Description
Technical field
The utility model belongs near field antenna field.Be specifically related to a kind of near field antenna of hyper band radio-frequency (RF) identification.
Background technology
In recent years, hyperfrequency (UHF, Ultrahigh Frequency) radio-frequency (RF) identification (RFID, Radio Frequency Identification) technology develop rapidly.Uhf band near field RFID (radio-frequency identification) system has attracted attentiveness widely due to the advantage of himself.Its proposition, solves around traditional UHF RFID label tag and there is high dielectric constant, when as water or metal, and a difficult problem for system cisco unity malfunction.Traditional UHF rfid system is based on the working method of Electromagnetic Wave Propagation, very sensitive to the media environment around label.The energy transmission mode of uhf band near field RFID systems both can be field coupled, also can be magnetic Field Coupling.In the system of magnetic Field Coupling, energy is mainly kept in magnetic field, only can affect by the object of high magnetic permeability, such object is uncommon in daily life.Exactly because this reason, LF/HF band RFID system (mode near field induction works) can under the media environment near metal or liquid reliably working.The proposition of uhf band near field RFID systems, can be applied to item level by radio-frequency recognition system, such as medical product, medication management, biologic applications etc.
The way of realization of current uhf band near field RFID read-write antenna has several as follows: 1. directly use far field antenna.This antenna effects extreme difference, near field distribution compares and is difficult to control, and easily occurs misreading due to its radiation characteristic.2. in loop antenna, load multiple electric capacity producing delayed phase effect, make the electric current on large loop antenna keep phase place consistent.This antenna can realize the read-write region of larger area equally, but still smaller in the mid portion magnetic field of large ring, and the loading of electric capacity makes the manufacture of antenna, debugging difficulty strengthens, and this also counteracts that it is applied.3. use reverse current to (ODCs, Opposite directed currents) thought design near field linear antenna or paster antenna, this antenna can realize the read-write region of larger area, but the component that only there is horizontal direction due to the magnetic field above electric current cause this kind of antenna exist directly over electric current blind area (blind area be defined as transmitting power constant time, vertical direction magnetic field is less than the region of-20dBm), this brings great inconvenience to practical application.
Summary of the invention
The utility model provides a kind of uhf band near field RFED antenna, large area, uniform Distribution of Magnetic Field, the intrinsic blind area of eliminating in read-write region can be realized by this antenna, thus the read-write region of near field RFED antenna, the stability of raising system can be increased, practicality is stronger.
The uhf band near field antenna that the utility model provides, comprises substrate, first module, second unit and feeding network, and wherein, first module and second unit are formed by conductor, and are positioned at the upper surface of substrate; Described first module and second unit comprise distributing point, current return path, terminal short circuit point and at least one electric current arm respectively, between the electric current arm of two unit transpostion interval arrangement but non-intersect; Described feeding network comprises the top conductor being positioned at upper surface of substrate and the lower floor's conductor being positioned at substrate lower surface and two conductive through holes, and two-layer conductor forms pinacoid transmission line jointly; The top conductor of described feeding network is directly connected with one end of the distributing point of first module, the distributing point opening part of second unit respectively, and lower floor's conductor of described feeding network is connected by described two conductive through holes with the other end of the distributing point of first module, the distributing point opening part of second unit respectively.
The difference of the electric current arm quantity of described second unit and the electric current arm quantity of first module is 1.
Described feeding network is to first module and second unit constant amplitude out of phase feed, and current feed phase difference is 90 °.
The far field antenna that uhf band near field RFID read-write antenna provided by the utility model is more traditional is compared, and beneficial effect is: utilize near field antenna that rfid system can be made more stable, the impact by surrounding metal, liquid, dielectric etc. is less.The more traditional uhf band near field RFID read-write antenna based on ODCs concept of uhf band RFID read-write antenna provided by the utility model, beneficial effect is: utilize near field antenna provided by the utility model, large-area read-write region can be realized, be evenly distributed at read-write region internal magnetic field simultaneously, non-blind area.Uhf band RFID read-write antenna provided by the utility model is compared with the delayed phase loop aerial based on loading capacitance, and beneficial effect is: antenna configuration is simple, read-write region is large.
Accompanying drawing explanation
Fig. 1 is the structural representation of uhf band near field RFID read-write antenna provided by the utility model.
Fig. 2 is the structural representation of uhf band near field RFID read-write antenna first module provided by the utility model.
Fig. 3 is the structural representation of uhf band near field RFID read-write antenna second unit provided by the utility model.
Fig. 4 is the structural representation of uhf band near field RFID read-write antenna feeding network provided by the utility model, and (a) is top level structure, and (b) is fabric.
Fig. 5 is the three-dimensional structure schematic diagram of uhf band near field RFID read-write antenna provided by the utility model.
Wherein, description of reference numerals is as follows: 101 antenna first modules, 102 antenna second units, 103 antenna feeding networks, 104 antenna substrates, the distributing point of first and second unit of 101a, 102a, the current return path of first and second unit of 101b, 102b, the terminal short circuit point of first and second unit of 101c, 102c, the electric current arm of first and second unit of 101d, 102d, the input of 103a feeding network, the power divider of 103b feeding network, the λ between 103c, 103d feeding network and first and second antenna element
g/ 4 matched impedance minor matters, the bottom layer ground conductor of 103e feeding network, the conductive through hole connected between 103f, 103g feeding network bottom layer ground conductor and first and second unit.
Embodiment
Below in conjunction with accompanying drawing, a kind of uhf band near field RFID read-write antenna embodiment that the utility model provides is described:
The antenna concrete structure of the utility model design as shown in Figure 1 and Figure 5, comprises first module 101, second unit 102, feeding network 103 and substrate 104.Wherein, substrate thickness is 1.6mm, and base type is FR-4 plate, and first module 101 and second unit 102 adopt conducting metal to make, and are positioned at the upper surface of substrate 104 across, and feeding network 103 is positioned at two surfaces up and down of substrate 104.
Refer to Fig. 2,3, the first module 101 of antenna, second unit 102 similar are all the stand-alone antennas based on ODCs concept.First module 101, second unit 102 comprise distributing point (101a, 102a), current return path (101b, 102b), terminal short circuit point (101c, 102c), at least one electric current arm (101d, 102d).Wherein the difference of the electric current arm quantity of second unit 102 and the electric current arm quantity of first module 101 is 1.
Refer to Fig. 4, the top conductor of feeding network 103 is directly connected with one end of the first distributing point 102a, second unit distributing point 102b opening part, and bottom layer ground conductor 103e is connected by conductive through hole 103f, 103g with the other end of first and second unit distributing point opening part.
The utility model devises a novel uhf band near field RFID read-write antenna on the basis of the near field linear antenna based on ODCs, by this kind of antenna, can produce uniform Distribution of Magnetic Field by near-field region above antenna.More traditional uhf band near field antenna, the area not only reading and writing region is comparatively large, and achieves being uniformly distributed of read-write region internal magnetic field, eliminates reverse current to intrinsic blind area.Utilize this novel practical antenna can build the near field RFID systems of large area, steady operation, have larger practical value.
Claims (3)
1.UHF frequency range near field RFID read-write antenna, comprise substrate, first module, second unit and feeding network, it is characterized in that, first module and second unit are formed by conductor, and are positioned at the upper surface of substrate; Described first module and second unit comprise distributing point, current return path, terminal short circuit point and at least one electric current arm respectively, between the electric current arm of two unit transpostion interval arrangement but non-intersect; Described feeding network comprises the top conductor being positioned at upper surface of substrate and the lower floor's conductor being positioned at substrate lower surface and two conductive through holes, and two-layer conductor forms pinacoid transmission line jointly; The top conductor of described feeding network is directly connected with one end of the distributing point of first module, the distributing point opening part of second unit respectively, and lower floor's conductor of described feeding network is connected by described two conductive through holes with the other end of the distributing point of first module, the distributing point opening part of second unit respectively.
2. uhf band near field RFID read-write antenna as claimed in claim 1, it is characterized in that, the difference of the electric current arm quantity of described second unit and the electric current arm quantity of first module is 1.
3. the uhf band near field RFID read-write antenna as described in claims 1 or 2, is characterized in that, described feeding network is to first module and second unit constant amplitude out of phase feed, and current feed phase difference is 90o.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420635127.6U CN204189949U (en) | 2014-10-29 | 2014-10-29 | Uhf band near field RFID read-write antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420635127.6U CN204189949U (en) | 2014-10-29 | 2014-10-29 | Uhf band near field RFID read-write antenna |
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| Publication Number | Publication Date |
|---|---|
| CN204189949U true CN204189949U (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420635127.6U Expired - Fee Related CN204189949U (en) | 2014-10-29 | 2014-10-29 | Uhf band near field RFID read-write antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394385A (en) * | 2017-08-25 | 2017-11-24 | 昆山法拉第智能科技有限公司 | A kind of UHF anti-metal electronic antenna |
| CN109994816A (en) * | 2019-04-24 | 2019-07-09 | 南京思追特电子科技有限公司 | Microstrip branch cable architecture |
| WO2020215258A1 (en) * | 2019-04-24 | 2020-10-29 | 南京思追特电子科技有限公司 | Micro-strip branch line structure |
-
2014
- 2014-10-29 CN CN201420635127.6U patent/CN204189949U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394385A (en) * | 2017-08-25 | 2017-11-24 | 昆山法拉第智能科技有限公司 | A kind of UHF anti-metal electronic antenna |
| CN109994816A (en) * | 2019-04-24 | 2019-07-09 | 南京思追特电子科技有限公司 | Microstrip branch cable architecture |
| WO2020215258A1 (en) * | 2019-04-24 | 2020-10-29 | 南京思追特电子科技有限公司 | Micro-strip branch line structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150304 Termination date: 20171029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |